Hey man I am absolutely gutted for you I know how stoaked you were to find one
As I have said before mine is such a guts she will now feed light on or off, but I didn't see her feed for months as they are such good night time scavengers so starvation would surprise me.
Just out of interest what temp do you keep the tank at? C. Zebras like it fairly warm at 27 - 30C. I keep mine at a minimum of 27C. Yours is a larger tank how do you heat it. I don't heat inline and as it is a large tank I run 2 heaters 1 x 200w by the filter intake and a 300w by the out take. I use juwel heaters so I can keep them vertical and hide them by the pipes.
One other question how did yu acclimate the fish? I have always drip aclimiated my plecs over 1 - 2 hrs adding a small amount of water every 10mins.
Sorry for asking basic questions and I don't want to seem like I am teaching you to suck eggs but if I can try and help you with this you may feel more confident to try again in the future.